CN113684875B - Soft soil stratum ultra-wide deep foundation pit construction process - Google Patents
Soft soil stratum ultra-wide deep foundation pit construction process Download PDFInfo
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- CN113684875B CN113684875B CN202110772213.6A CN202110772213A CN113684875B CN 113684875 B CN113684875 B CN 113684875B CN 202110772213 A CN202110772213 A CN 202110772213A CN 113684875 B CN113684875 B CN 113684875B
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- tamping
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- soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F7/00—Equipment for conveying or separating excavated material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
Abstract
The invention discloses a construction process of a super-wide deep foundation pit in a soft soil stratum, which comprises a crawler belt and is characterized in that: the automatic collecting and tamping device is characterized in that a vehicle body is arranged above the crawler, a right bearing of the vehicle body is connected with a mechanical arm, the right side of the mechanical arm is in transmission connection with a collecting and tamping mechanism and an excavating mechanism, the collecting and tamping mechanism comprises a drying assembly and a collecting and tamping assembly, the collecting and tamping assembly comprises an outer shell, a tipping bucket is slidably connected inside the outer shell, a spring is fixedly mounted below the tipping bucket, a fixing rod is fixedly mounted below the spring, a rotating shaft is fixedly mounted inside the fixing rod, the drying assembly is located on the inner side of the collecting and tamping assembly, the drying assembly comprises a flexible film, the rotating shaft penetrates through the flexible film, a friction plate is slidably connected on the inner side of the outer shell, and the outer side of the friction plate is attached to the flexible film.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction process of an ultra-wide deep foundation pit in a soft soil stratum.
Background
The excavation of the soft soil deep foundation pit is an important part of foundation pit engineering construction, and for foundation pits with large earthwork amount, the excavation construction technology not only relates to the speed of foundation pit engineering construction, but also relates to the safety bearing of a foundation pit supporting structure and the safety and the danger of engineering piles, particularly the condition of having ultra-deep pits.
The existing deep foundation pit construction process is poor in practicability; meanwhile, when the existing deep foundation pit construction process is used for layered excavation, a 10-20 cm protective layer is reserved for manual excavation generally, original soil is protected from disturbance, meanwhile, with the development of economy, manual wages are increased very quickly, and for the construction process needing manual excavation, time consumption is long, cost is high, and construction cost is not saved. Therefore, it is necessary to design an ultra-wide deep foundation pit construction process for a soft soil stratum, which saves labor and shortens construction period.
Disclosure of Invention
The invention aims to provide a construction process of an ultra-wide deep foundation pit in a soft soil stratum, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides a soft soil stratum super wide deep basal pit construction technology, includes the track, its characterized in that: the top of track is provided with the automobile body, the right side bearing of automobile body is connected with the arm, the right side transmission of arm is connected with collects tamping mechanism and excavates the mechanism.
According to the technical scheme, the collection tamping mechanism comprises a drying assembly and a collection tamping assembly, the collection tamping assembly comprises an outer shell, the inner sliding connection of the outer shell is provided with a tipping bucket, the lower part of the tipping bucket is fixedly provided with a spring, the lower part of the spring is fixedly provided with a fixing rod, and the inner part of the fixing rod is fixedly provided with a rotating shaft.
According to the technical scheme, the drying assembly is located on the inner side of the collecting tamping assembly and comprises the flexible membrane, the rotating shaft penetrates through the interior of the flexible membrane, the inner side of the outer shell is connected with the friction plate in a sliding mode, the outer side of the friction plate is attached to the flexible membrane, and the lower portion of the friction plate is fixedly mounted with the rotating shaft through the spring.
According to the technical scheme, the excavating mechanism comprises an excavating shell and a collecting tank, the excavating shell and the collecting tank are fixedly connected, the outer side of the excavating shell is fixedly provided with bevel teeth, the inner fixed mounting of the excavating shell is provided with a drill bit, the right side of the drill bit is fixedly provided with a drill bit, the left side of the drill bit is fixedly connected with the right side of the movable shaft through a spring, the right side of the excavating shell is connected with movable fan blades through a bearing, the top bearing of the movable fan blades is connected with a connecting rod, and the connecting rod is fixedly mounted on the outer surface of the movable shaft.
According to the technical scheme, the protective shell is fixedly mounted inside the collecting tank, an electric cylinder is connected to an inner bearing of the protective shell, the outer side of the electric cylinder is connected with the movable shaft through a bearing, and the electric cylinder is electrically connected with the inside of the vehicle body.
According to the technical scheme, the inside fixed mounting of arm has the motor, the outside transmission of motor is connected with the transmission shaft, the below fixedly connected with drive gear one and drive gear four of transmission shaft, the opposite side meshing of drive gear one is connected with drive gear two, the opposite side meshing of drive gear four is connected with drive gear three, one side of drive gear two and drive gear three all is fixed mounting with the rotation axis, the below of transmission shaft is fixed connection with the top of collecting vat, the below fixed mounting of transmission shaft and rotation axis has the mounting bracket.
According to the technical scheme, the construction process of the ultra-wide deep foundation pit in the soft soil stratum comprises the following steps:
s1: measuring and lofting;
s2: draining water from the ground or reducing the underground water level and the hardening of the road surface near the foundation pit;
s3: excavating at a first stage and carrying out first supporting structure construction;
s4: excavating at the second stage, constructing a second supporting structure, and excavating and supporting the structure layer by layer;
s5: and excavating the foundation pit to the designed substrate elevation, constructing the cushion layer, the bottom plate waterproof layer, the bottom plate and the side wall at the bottom, and gradually dismantling the supporting structure.
According to the technical scheme, in the steps S3 and S4, an excavator is used for carrying out earth excavation, a bulldozer is used for pushing surface soil, an excavation side slope is controlled according to a design excavation drawing in construction, underexcavation and overbreak are not required to occur, and a 20cm protective layer reserved at the bottom of a foundation is trimmed to a design elevation by using excavating equipment when the next process is started.
According to the technical scheme, the steps of trimming the excavating equipment in the steps S3 and S4 are as follows:
a1: firstly, driving the excavating equipment to a position to be repaired, then adjusting the angle of the excavating mechanism by using the mechanical arm, and then starting the motor to enable the excavating mechanism to start rotating to excavate a construction area;
a2: along with the excavation, the movable shaft can stretch back and forth by controlling the movement of the electric cylinder, so that the inclination angle of the movable fan blade is controlled, the excavation range can be further finely adjusted, the excavation range is finer and controllable, and simultaneously, the bevel teeth rotate on the outer side to turn the soil layer in the excavation area, so that the collection of the surface soil by the collection tamping mechanism is quicker and more convenient;
a3: the tipping bucket collects surface soil by anticlockwise rotation of the collecting tamping mechanism, the soil layer is collected and then rotates in the outer shell, the soil layer is extruded and bonded together under the action of centrifugal force and is collected in the outer shell, meanwhile, the drying assembly in the collecting tamping mechanism rotates, friction is generated to generate heat, as the collected soil layers become more, the flexible membrane is extruded by the soil layer, so that the flexible membrane is more tightly attached to the friction plate, the contact area becomes larger, more heat is further generated, the soil layer is drier, excessive water in the soil layer is avoided, muddy water drips from the car hopper in the transportation process, and pollution is caused to the urban environment;
a4: when collecting the end, at this moment make to collect tamping mechanism and carry out clockwise rotation, and the soil layer bonding is in the same place this moment, can not flow from excavating equipment, and the tipping bucket carries out clockwise rotation and can tamp the soil layer for the soil layer is compacter, can open the mechanism afterwards, through the motion of arm, emptys out the soil layer of inside collection.
According to the technical scheme, the drying assembly and the collecting tamping assembly are separated by the flexible membrane.
Compared with the prior art, the invention has the following beneficial effects: in the invention, the collecting and tamping mechanism is arranged, and the soil on the surface layer is collected by utilizing the anticlockwise rotation of the mechanism, when the collection and excavation are finished, the mechanism can tamp the soil layer on the surface layer by utilizing the clockwise rotation of the mechanism, thereby realizing the function of automatically collecting and tamping soil layers by using the mechanism, adjusting the excavating range of an excavating bit of the mechanism by arranging the excavating mechanism, thereby ensuring that the excavation range is more precise and controllable, further improving the construction efficiency, avoiding the use of manual excavation, meanwhile, the over-digging and under-digging conditions are avoided, the backfilling and the trimming are reduced, the heat generated by the assembly can be increased along with the increase of the collected soil by arranging the drying assembly, the drying effect is kept stable, and meanwhile, soil is dried, and the pollution to urban roads caused by the dropping of water in the soil from the car hopper in the transportation process is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic overall elevational cross-sectional structural view of the present invention;
FIG. 2 is a schematic view of the overall top view of the present invention;
FIG. 3 is an overall schematic view of the digging mechanism of the present invention;
FIG. 4 is a cross-sectional schematic view of the digging mechanism of the present invention;
FIG. 5 is an internal side schematic view of the collection tamping mechanism of the present invention;
FIG. 6 is an internal schematic view of the drying assembly of the present invention;
FIG. 7 is a side view of the drying assembly of the present invention;
in the figure: 1. a crawler; 2. a vehicle body; 3. a mechanical arm; 4. a drive shaft; 5. a first transmission gear; 6. a second transmission gear; 7. a third transmission gear; 8. a fourth transmission gear; 9. an electric cylinder; 10. collecting tank; 11. a protective shell; 12. excavating a shell; 13. conical teeth; 14. a movable fan blade; 15. a connecting rod; 16. a drill bit; 17. a bit housing; 18. a movable shaft; 19. an outer housing; 20. tipping; 21. a rotating shaft; 22. a fixing rod; 23. a friction plate; 24. a flexible membrane.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides the following technical solutions: the utility model provides a soft soil stratum super wide deep basal pit construction technology, includes track 1, its characterized in that: a vehicle body 2 is arranged above the crawler 1, the right side of the vehicle body 2 is in bearing connection with a mechanical arm 3, and the right side of the mechanical arm 3 is in transmission connection with a collecting and tamping mechanism and an excavating mechanism; through being provided with and collecting tamping mechanism, utilize the anticlockwise rotation of this mechanism, collect the soil on top layer, when collecting to excavate the end, utilize the clockwise rotation of this mechanism, make this mechanism can tamp the soil layer on top layer, thereby utilize this mechanism to realize the effect of automatic collection with tamp soil layer, excavate the mechanism through setting up, the scope of excavating to this mechanism excavation bit is adjusted to the utilization, thereby it is more meticulous and controllable to make the scope of excavating, the efficiency of construction is further improved, avoid using manual excavation, the condition of overexcavation and undermining has been avoided simultaneously, backfill and trimming have been reduced.
The collecting and tamping mechanism comprises a drying component and a collecting and tamping component, the collecting and tamping component comprises an outer shell 19, a tipping bucket 20 is connected inside the outer shell 19 in a sliding manner, a spring is fixedly arranged below the tipping bucket 20, a fixed rod 22 is fixedly arranged below the spring, and a rotating shaft 21 is fixedly arranged inside the fixed rod 22; when the collecting and tamping assembly operates, the rotating shaft 21 rotates, firstly rotates anticlockwise, the tipping bucket 20 rotates along with the rotation and moves up and down under the action of gravity, when the tipping bucket 20 is positioned at the lowest part, the tipping bucket 20 extrudes and collects soil on the surface layer and then moves upwards, when the tipping bucket 20 moves to the highest part, the tipping bucket 20 moves downwards under the action of gravity and is integrally positioned in the outer shell 19 and then rotates, the opening of the tipping bucket 20 is downward, the soil in the inner part is dumped in the outer shell 19 by the tipping bucket 20, then the soil is bonded together under the action of the fixing rod 22 and the centrifugal force, when the collecting and excavating are finished, the rotating direction of the tipping bucket 20 can be changed, so that the tipping bucket 20 rotates clockwise, meanwhile, the weight of the outer shell 19 is increased, the tipping bucket 20 rotates, the ground surface can be compacted, and the tamping force is improved, the soil layer is firmer, and meanwhile, the tipping bucket 20 can be prevented from being extruded and deformed under the action of pressure due to the arrangement of the spring.
The drying assembly is positioned at the inner side of the collecting and tamping assembly and comprises a flexible membrane 24, the rotating shaft 21 penetrates through the flexible membrane 24, the inner side of the outer shell 19 is connected with a friction plate 23 in a sliding manner, the outer side of the friction plate 23 is attached to the flexible membrane 24, and the lower part of the friction plate 23 is fixedly installed with the rotating shaft 21 through a spring; when normal rotation, under the centrifugal action, friction takes place between friction disc 23 can and the shell body 19, produce the heat, dry inside, along with the collection of earth, collect more when earth, the inside earth of subassembly can produce bigger extrusion force to flexible membrane 24, make flexible membrane 24 extrusion friction disc 23, thereby it is inseparabler to make friction disc 23 and the laminating of flexible membrane 24, make frictional force between it also bigger, the heat that friction disc 23 produced can be more like this, thereby the heat that makes the subassembly produce can increase along with the earth of collecting increases, make drying effect remain stable, avoid simultaneously in the transportation water in the earth to drip from the car hopper and cause the pollution to urban road.
The excavating mechanism comprises an excavating shell 12 and a collecting tank 10, wherein the excavating shell 12 is fixedly connected with the collecting tank 10, bevel teeth 13 are fixedly mounted on the outer side of the excavating shell 12, a drill bit shell 17 is fixedly mounted in the excavating shell 12, a drill bit 16 is fixedly mounted on the right side of the drill bit shell 17, a movable shaft 18 is arranged on the left side of the drill bit 16, the left side of the drill bit 16 is fixedly connected with the right side of the movable shaft 18 through a spring, a right side bearing of the excavating shell 12 is connected with a movable fan blade 14, a top bearing of the movable fan blade 14 is connected with a connecting rod 15, and the connecting rod 15 is fixedly mounted on the outer surface of the movable shaft 18; when excavating the mechanism function, this mechanism is whole to be rotatory, along with excavating equipment's marcing, excavate the earth's surface, drill bit 16 rotates, the soil layer of excavation can be under the extrusion of activity flabellum 14, get into the inside of collecting vat 10 in the clearance of excavation casing 12, when excavating the protective layer, can be through the distance of adjustment loose axle 18, make connecting rod 15 rotate, thereby it rotates to drive activity flabellum 14, change activity flabellum 14's angle, when activity flabellum 14 is opened the angle big, at this moment, it can improve to excavate efficiency, the degree of depth of excavation also can become dark, thereby adjust excavation efficiency and excavation depth, excavate the rotation of casing 12 simultaneously, make awl tooth 13 can become flexible to the soil layer of earth's surface, make collection tamp mechanism more quick when collecting.
A protective shell 11 is fixedly arranged inside the collecting tank 10, an electric cylinder 9 is connected to the inner bearing of the protective shell 11, the outer side of the electric cylinder 9 is connected with a movable shaft 18 through a bearing, and the electric cylinder 9 is electrically connected with the inside of the vehicle body; the movable shaft 18 is moved back and forth by a change in the air pressure inside the electric cylinder 9, thereby controlling the rotation of the movable fan 14.
A motor is fixedly installed inside the mechanical arm 3, a transmission shaft 4 is connected to the outer side of the motor in a transmission mode, a first transmission gear 5 and a fourth transmission gear 8 are fixedly connected to the lower portion of the transmission shaft 4, a second transmission gear 6 is connected to the other side of the first transmission gear 5 in a meshing mode, a third transmission gear 7 is connected to the other side of the fourth transmission gear 8 in a meshing mode, one sides of the second transmission gear 6 and the third transmission gear 7 are fixedly installed with the rotating shaft 21, the lower portion of the transmission shaft 4 is fixedly connected with the upper portion of the collecting tank 10, and an installing frame is fixedly installed below the transmission shaft 4 and the rotating shaft 21; the motor is used for driving the transmission shaft 4 to rotate, the first transmission gear 5 and the fourth transmission gear 8 on the transmission shaft 4 rotate, the second transmission gear 6 and the third transmission gear 7 are pushed to rotate, the second transmission gear 6 and the third transmission gear 7 can drive the rotating shaft 21 to rotate, and therefore the collecting and tamping mechanism operates.
The construction process of the ultra-wide deep foundation pit in the soft soil stratum comprises the following steps:
s1: measuring and lofting;
s2: draining water from the ground or reducing the underground water level and the hardening of the road surface near the foundation pit;
s3: excavating at a first stage and constructing a first supporting structure;
s4: excavating at the second stage, constructing a second supporting structure, and excavating and supporting the structure layer by layer;
s5: and excavating the foundation pit to the designed substrate elevation, constructing the cushion layer, the bottom plate waterproof layer, the bottom plate and the side wall at the bottom, and gradually dismantling the supporting structure.
In the steps S3 and S4, an excavator is used for excavating earthwork, a bulldozer is used for pushing surface soil, an excavation side slope is controlled according to a design excavation drawing in construction, underexcavation and overexcavation are not required to occur, and a 20cm protective layer reserved at the bottom of a foundation is trimmed to a design elevation by using excavating equipment when the next procedure starts.
The steps of the excavation equipment truing in S3 and S4 are as follows:
a1: firstly, driving the excavating equipment to a position to be repaired, adjusting the angle of the excavating mechanism by using the mechanical arm 3, and then starting a motor to ensure that the excavating mechanism starts to rotate to excavate a construction area;
a2: along with the excavation, the movable shaft 18 can stretch back and forth by controlling the movement of the electric cylinder 9, so that the inclination angle of the movable fan blades 14 is controlled, the excavation range can be further finely adjusted, the excavation range is finer and controllable, and meanwhile, the bevel teeth 13 rotate on the outer side to turn over the soil layer in the excavation area, so that the collection of the surface soil by the collection tamping mechanism is quicker and more convenient;
a3: the tipping bucket 20 collects surface soil by utilizing the anticlockwise rotation of the collecting tamping mechanism, the soil layer is collected and then rotates in the outer shell 19, the soil layer is extruded and bonded together under the action of centrifugal force and is collected in the outer shell 19, meanwhile, the drying assembly in the collecting tamping mechanism rotates, friction is generated to generate heat, as the collected soil layer is increased, the flexible membrane 24 is extruded by the soil layer, so that the flexible membrane is more tightly attached to the friction plate 23, the contact area is increased, more heat is further generated, the soil layer is drier, the phenomenon that the soil layer contains excessive water is avoided, muddy water drips from a car hopper in the transportation process, and pollution is caused to the urban environment;
a4: when collecting the end, at this moment make collect tamping mechanism and carry out clockwise rotation, and the soil layer bonding is in the same place this moment, can not flow from excavating equipment, and tipping bucket 20 carries out clockwise rotation and can tamp the soil layer for the soil layer is compacter, can open the mechanism afterwards, and the soil layer of collecting inside is emptyd out through the motion of arm 3.
The drying assembly and the collecting tamping assembly are separated by a flexible membrane 24; the collected soil is utilized to extrude the flexible membrane 24, so that the flexible membrane 24 is attached to the drying assembly more tightly.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a soft soil stratum super wide deep basal pit construction technology, this soft soil stratum super wide deep basal pit construction technology adopts following excavating equipment, including track (1), its characterized in that: a vehicle body (2) is arranged above the crawler (1), a right side bearing of the vehicle body (2) is connected with a mechanical arm (3), and the right side of the mechanical arm (3) is in transmission connection with a collecting tamping mechanism and an excavating mechanism; the collecting and tamping mechanism comprises a drying assembly and a collecting and tamping assembly, the collecting and tamping assembly comprises an outer shell (19), a tipping bucket (20) is connected inside the outer shell (19) in a sliding manner, a spring is fixedly installed below the tipping bucket (20), a fixing rod (22) is fixedly installed below the spring, and a rotating shaft (21) is fixedly installed inside the fixing rod (22); the drying assembly is arranged on the inner side of the collecting and tamping assembly and comprises a flexible membrane (24), the rotating shaft (21) penetrates through the flexible membrane (24), the inner side of the outer shell (19) is connected with a friction plate (23) in a sliding mode, the outer side of the friction plate (23) is attached to the flexible membrane (24), and the lower portion of the friction plate (23) is fixedly installed with the rotating shaft (21) through a spring; excavate the mechanism including excavating casing (12) and collecting vat (10), it is fixed connection with collecting vat (10) to excavate casing (12), the outside fixed mounting who excavates casing (12) has awl tooth (13), the inside fixed mounting who excavates casing (12) has drill bit casing (17), the right side fixed mounting of drill bit casing (17) has drill bit (16), the left side of drill bit (16) is provided with loose axle (18), the left side of drill bit (16) is in the same place through spring fixed connection with the right side of loose axle (18), the right side bearing that excavates casing (12) is connected with activity flabellum (14), the top bearing of activity flabellum (14) is connected with connecting rod (15), connecting rod (15) fixed mounting is at the surface of loose axle (18).
2. The soft soil stratum ultra-wide deep foundation pit construction process according to claim 1, characterized in that: the collecting vat (10) inside fixed mounting have protective housing (11), the inside bearing of protective housing (11) is connected with electric cylinder (9), the outside and loose axle (18) of electric cylinder (9) are the bearing connection, electric cylinder (9) are connected for the electricity with the automobile body is inside.
3. The soft soil stratum ultra-wide deep foundation pit construction process according to claim 2, characterized in that: the inside fixed mounting of arm (3) has the motor, the outside transmission of motor is connected with transmission shaft (4), the below fixedly connected with drive gear (5) and drive gear four (8) of transmission shaft (4), the opposite side meshing of drive gear (5) is connected with drive gear two (6), the opposite side meshing of drive gear four (8) is connected with drive gear three (7), one side of drive gear two (6) and drive gear three (7) all is fixed mounting with rotation axis (21), the below of transmission shaft (4) is fixed connection with the top of collecting vat (10), the below fixed mounting of transmission shaft (4) and rotation axis (21) has the mounting bracket.
4. The soft soil stratum ultra-wide deep foundation pit construction process according to claim 3, characterized in that: the construction process of the ultra-wide deep foundation pit in the soft soil stratum comprises the following steps:
s1: measuring and lofting;
s2: draining water from the ground or reducing the underground water level and the hardening of the road surface near the foundation pit;
s3: excavating at a first stage and constructing a first supporting structure;
s4: excavating at the second stage, constructing a second supporting structure, and excavating and supporting the structure layer by layer;
s5: and excavating the foundation pit to the designed substrate elevation, constructing the cushion layer, the bottom plate waterproof layer, the bottom plate and the side wall at the bottom, and gradually dismantling the supporting structure.
5. The soft soil stratum ultra-wide deep foundation pit construction process according to claim 4, characterized in that: in the steps S3 and S4, an excavator is used for excavating earthwork, a bulldozer is used for pushing surface soil, an excavation side slope is controlled according to a design excavation drawing in construction, underexcavation and overexcavation are not required to occur, and a 20cm protective layer reserved at the bottom of a foundation is trimmed to a design elevation by using excavating equipment when the next procedure starts.
6. The soft soil stratum ultra-wide deep foundation pit construction process according to claim 5, characterized in that: the steps of trimming the excavating equipment in S3 and S4 are as follows:
a1: firstly, driving the excavating equipment to a position needing to be repaired, then adjusting the angle of the excavating mechanism by using the mechanical arm (3), and then starting a motor to ensure that the excavating mechanism starts to rotate to excavate a construction area;
a2: along with the excavation, the movable shaft (18) can stretch back and forth by controlling the movement of the electric cylinder (9), so that the inclination angle of the movable fan blades (14) is controlled, the excavation range can be further finely adjusted, the excavation range is finer and controllable, and simultaneously the bevel teeth (13) rotate on the outer side to turn over the soil layer in the excavation area, so that the collection of surface soil by the collection tamping mechanism is quicker and more convenient;
a3: the collection tamping mechanism rotates anticlockwise, so that the tipping bucket (20) collects surface soil, the soil layer is collected and then rotates in the outer shell (19), the soil layer can be extruded and bonded together under the action of centrifugal force and collected in the outer shell (19), meanwhile, the drying assembly in the collection tamping mechanism rotates, heat is generated by friction, the flexible film (24) can be extruded by the soil layer along with the collected soil layer, so that the flexible film is more tightly attached to the friction plate (23), the contact area is larger, more heat is further generated, the soil layer is drier, the soil layer is prevented from containing too much water, muddy water drips from the car hopper in the transportation process, and pollution is caused to the urban environment;
a4: when collecting the end, at this moment make collect tamping mechanism and carry out clockwise rotation, and the soil layer bonding is in the same place this moment, can not flow from excavating equipment, and tipping bucket (20) carry out clockwise rotation and can tamp the soil layer for the soil layer is compacter, can open the mechanism afterwards, through the motion of arm (3), emptys out the soil layer of inside collection.
7. The soft soil stratum ultra-wide deep foundation pit construction process according to claim 6, characterized in that: the drying assembly and the collection tamping assembly are separated by a flexible membrane (24).
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